Does pineapple effect my period?

Not directly. Pineapple can affect various enzymes in your liver, which can affect how various medications work in your body. Depending on what medications you are taking, it is certainly possible for pineapple to be indirectly affecting your periods. Worth checking in with your doc about.
Bromelain. Coumadin (warfarin) clinics suggest bromelain from pineapple can potentiate bleeding tendencies - so for people who have a tendency to bleed we avoid this - bromelain comes from pineapple fyi.
Pineapple and period. Pineapple should not be affecting your periods unless you are having some severe allergic reaction to it causing you to be ill.